<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link rel="stylesheet" href="">
    <STYLE TYPE="text/css">   
       .mio{
            font-size: 25px;
            color: blue;
        }
    </STYLE>
    <script type="text/javascript">
        var a,b;
        a = "JavaScript,";
        b = "<b class='mio'>欢迎您</b>";
        document.write(a+b);
    </script>
</head>
<body>
    
</body>
</html>